172 Bulletin of Laboratories of Denison University. [Voi. xii 



tions indicated in the general character and thickness of the 

 rocks. These formations have been described in sufficient de- 

 tail under the Cartersville district, and will not be repeated 

 here. The Knox dolomite of the Cave Spring district needs 

 further description, since it is the only formation in the ai'ea 

 with which the manganese-ores are associated. 



The Knox dolomite is vastly the most extensive formation 

 in the district. The percentage of chert is much larger, and 

 the cherty masses and fragments are larger in size than else- 

 where for this formation. In places, the limestone appears to 

 be largely replaced by layers of the massive chert. Its surface 

 is very generally strewn with the chert, and the deep-red clays 

 derived from the limestone are heavily charged with the chert- 

 fragments in all stages of decay. 



Fig. 10. 



Watsoo. 



Section in Knox Dolomite, 2 miles East of Kingston, Georgia, Illustrating 



Weathering of the Magnesian Limestone. (Modified from Spencer.) 



A, residual clay ; B, fresh magnesian limestone. 



Sti^ctiire. — Referring again to the map (Fig. 9), it is ob- 

 served that nearly the entire southeast part is occupied by the 

 massive Knox dolomite, which resisted the sharp folding mani- 

 fested in some of the other formations. The remaining part of 

 the map indicates numerous faults cutting the strata. These 

 are mostly of the minor-thrust type, intersecting the Knox 

 dolomite and the Conasauga shale, and they expose at the sur- 



